<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>菜鸟教程(runoob.com)</title>
    <style>
        body {
            background-image: url('images/img_tree.png');
            background-repeat: no-repeat;
        }
    </style>
</head>

<body>
    <h1>Hello World!</h1>
    <p>runoob 背景图片实例。</p>
    <p>背景图片只显示一次,但它打扰到读者!</p>
</body>

</html>